Method of calculating positioning environment context index

Abstract

Provided is a method of calculating a positioning environment context index for classifying observation environments to help a user device global navigation satellite system (GNSS) in providing accurate location information. The method includes classifying and defining various observation environments by index, receiving observation values including at least the number of visible satellites, position dilution of precision (PDOP), and a carrier-to-noise density ratio (C/N0) with respect to a target observation environment, performing an exception handling process based on the number of visible satellites, selecting a process among a raw index calculation process and a calibrated index calculation process based on presence or absence of the PDOP, and deriving the index corresponding to the target observation environment based on the C/N0 or the C/N0 and PDOP via the selected process.

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